Http://www.phschool.com/science/biology_place/biocoach/bioprop/folding.html hope it helpps
Because they want to know the existence of aliens
Answer:
d. Ao x oo
Explanation:
The other crosses with A would all result in complete dominance because the alleles (other than A) from the other parent are dominant. Because option D. crosses a h o m o zygous parent with a recessive trait, the cross could produce a child with blood type A.